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Article: Geochemistry and tectonic significance of basaltic lavas in the Neoproterozoic Yanbian Group, Southern Sichuan province, Southwest China

TitleGeochemistry and tectonic significance of basaltic lavas in the Neoproterozoic Yanbian Group, Southern Sichuan province, Southwest China
Authors
Issue Date2007
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 2007, v. 49 n. 6, p. 554-571 How to Cite?
AbstractThe -840 Ma Yanbian Group on the western margin of the Yangtze block, Southwest China, is a >6 km thick, volcanic-sedimentary sequence consisting of basaltic lavas + associated cherty layers in the lower part, and flysch deposits in the upper part. The lavas have variable bulk-rock compositions: SiO 2 ranges from 45.3 to 50.7 wt%, Al 2O 3 from 12.8 to 16.8 wt%, and TiO 2 from 1.3 to 2.9 wt%. Although the incompatible trace elements, including Nb, Ta, Zr, Hf, Ti, and HREE, are similar to those of MORB, the lavas show features of island-arc tholeiites with pronounced enrichments in Rb, Ba, U, Sr, and Pb. They are characterized by low initial 87Sr/ 86Sr ratios (0.7030 to 0.7040) and strongly depleted εNd(t) values (+3.8 to +8.0). These geochemical features of the basaltic lavas suggest derivation from an N-MORB-type mantle source modified by slab-derived fluids and formation in an extensional back-arc basin setting. This conclusion supports an arc setting along the western margin of the Yangtze block during Neoproterozoie time. Therefore, the western margin of the Yangtze block can be correlated with the northeastern margin of the Greater India plate, both being an active arc above an eastward subduction zone at that time. Copyright © 2007 by V. H. Winston & Son, Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72833
ISSN
2015 Impact Factor: 2.365
2015 SCImago Journal Rankings: 1.248
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSun, WHen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, JHen_HK
dc.date.accessioned2010-09-06T06:45:32Z-
dc.date.available2010-09-06T06:45:32Z-
dc.date.issued2007en_HK
dc.identifier.citationInternational Geology Review, 2007, v. 49 n. 6, p. 554-571en_HK
dc.identifier.issn0020-6814en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72833-
dc.description.abstractThe -840 Ma Yanbian Group on the western margin of the Yangtze block, Southwest China, is a >6 km thick, volcanic-sedimentary sequence consisting of basaltic lavas + associated cherty layers in the lower part, and flysch deposits in the upper part. The lavas have variable bulk-rock compositions: SiO 2 ranges from 45.3 to 50.7 wt%, Al 2O 3 from 12.8 to 16.8 wt%, and TiO 2 from 1.3 to 2.9 wt%. Although the incompatible trace elements, including Nb, Ta, Zr, Hf, Ti, and HREE, are similar to those of MORB, the lavas show features of island-arc tholeiites with pronounced enrichments in Rb, Ba, U, Sr, and Pb. They are characterized by low initial 87Sr/ 86Sr ratios (0.7030 to 0.7040) and strongly depleted εNd(t) values (+3.8 to +8.0). These geochemical features of the basaltic lavas suggest derivation from an N-MORB-type mantle source modified by slab-derived fluids and formation in an extensional back-arc basin setting. This conclusion supports an arc setting along the western margin of the Yangtze block during Neoproterozoie time. Therefore, the western margin of the Yangtze block can be correlated with the northeastern margin of the Greater India plate, both being an active arc above an eastward subduction zone at that time. Copyright © 2007 by V. H. Winston & Son, Inc. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_HK
dc.relation.ispartofInternational Geology Reviewen_HK
dc.titleGeochemistry and tectonic significance of basaltic lavas in the Neoproterozoic Yanbian Group, Southern Sichuan province, Southwest Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0020-6814&volume=49&spage=554&epage=571&date=2007&atitle=Geochemistry+and+Tectonic+Significance+of+Basaltic+Lavas+in+the+Neoproterozoic+Yanbian+Group,+Southern+Sichuan+Province,+Southwest+China.en_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2747/0020-6814.49.6.554en_HK
dc.identifier.scopuseid_2-s2.0-34347344777en_HK
dc.identifier.hkuros144259en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34347344777&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume49en_HK
dc.identifier.issue6en_HK
dc.identifier.spage554en_HK
dc.identifier.epage571en_HK
dc.identifier.isiWOS:000247156600004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridSun, WH=7404011340en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, JH=11140043500en_HK

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